共查询到20条相似文献，搜索用时 15 毫秒
1.
The Austroalpine nappe systems in SE-Switzerland and N-Italy preserve remnants of the Adriatic rifted margin. Based on new
maps and cross-sections, we suggest that the complex structure of the Campo, Grosina/Languard, and Bernina nappes is inherited
largely from Jurassic rifting. We propose a classification of the Austroalpine domain into Upper, Middle and Lower Austroalpine
nappes that is new because it is based primarily on the rift-related Jurassic structure and paleogeography of these nappes.
Based on the Alpine structures and pre-Alpine, rift-related geometry of the Lower (Bernina) and Middle (Campo, Grosina/Languard)
Austroalpine nappes, we restore these nappes to their original positions along the former margin, as a means of understanding
the formation and emplacement of the nappes during initial reactivation of the Alpine Tethyan margin. The Campo and Grosina/Languard
nappes can be interpreted as remnants of a former necking zone that comprised pre-rift upper and middle crust. These nappes
were juxtaposed with the Mesozoic cover of the Bernina nappe during Jurassic rifting. We find evidence for low-angle detachment
faults and extensional allochthons in the Bernina nappe similar to those previously described in the Err nappe and explain
their role during subsequent reactivation. Our observations reveal a strong control of rift-related structures during the
subsequent Alpine reactivation on all scales of the former distal margin. Two zones of intense deformation, referred to as
the Albula-Zebru and Lunghin-Mortirolo movement zones, have been reactivated during Alpine deformation and cannot be described
as simple monophase faults or shear zones. We propose a tectonic model for the Austroalpine nappe systems that link inherited,
rift-related structures with present-day Alpine structures. In conclusion, we believe that apart from the direct regional
implications, the results of this paper are of general interest in understanding the control of rift structures during reactivation
of distal-rifted margins. 相似文献
2.
Alpine‐type orogens are interpreted to result from the collision of former rifted margins. As many present‐day rifted margins consist of hyper‐extended domains floored by thinned continental crust (<10 km) and/or exhumed mantle, this study explores the influence of rift inheritance on the architecture and final evolution of Alpine‐type orogens. We propose that rift‐related necking zones, separating weakly thinned 25‐ to 30‐km‐thick crust from hyper‐extended domains, may act as buttresses during the transition from subduction to collision. As a result, former necking zones may now be found at the boundary between a highly deformed and overthickened nappe stack, made of relics of hyper‐extended domains, and an external, weakly deformed fold‐and‐thrust belt, which largely escaped significant rift‐related crustal thinning and orogeny‐related thickening. Therefore, the role of rift inheritance is of critical importance and is largely underestimated in controlling the architecture and evolution of Alpine‐type orogens. 相似文献
3.
Asymmetry or symmetry of magma‐poor rifted margins refers commonly to the crustal architecture and the occurrence or absence of large‐scale extensional detachment faults. While distal parts of magma‐poor rifted margins are often considered to be asymmetric, the observation of downlapping sedimentary sequences over exhumed mantle domains at conjugate margins suggests a symmetric evolution during mantle exhumation. On the basis of seismic observations along the Iberia–Newfoundland and Australia–Antarctica margins, we propose that their most distal parts show evidence for the development of multiple, out‐of‐sequence asymmetric detachment faults. We present evidence for cyclic delocalization and re‐localization of deformation, resulting in an apparent symmetry of the exhumed mantle domain. The interaction between out‐of‐sequence detachment systems and the successive rise of the asthenosphere may explain the observed transition from fault‐controlled to magma‐controlled strain accommodation and the transition to more symmetric and localized accretion associated with the formation of a stable spreading center. 相似文献
4.
Numerical experiments reproduce the fundamental architecture of magma-poor rifted margins such as the Iberian or Alpine margins
if the lithosphere has a weak mid-crustal channel on top of strong lower crust and a horizontal thermal weakness in the rift
center. During model extension, the upper crust undergoes distributed collapse into the rift center where the thermally weakened
portion of the model tears. Among the features reproduced by the modeling, we observe: (1) an array of tilted upper-crustal
blocks resting directly on exhumed mantle at the distal margin, (2) consistently oceanward-dipping normal faults, (3) a mid-crustal
high strain zone at the base of the crustal blocks (S-reflector), (4) new ocean floor up against a low angle normal fault
at the tip of the continent, (5) shear zones consistent with continentward-dipping reflectors in the mantle lithosphere, (6)
the mismatch frequently observed between stretching values inferred from surface extension and bulk crustal thinning at distal
margins (upper plate paradox). Rifting in the experiment is symmetric at a lithospheric scale and the above features develop
on both sides of the rift center. We discuss three controversial points in more detail: (1) weak versus strong lower crust,
(2) the deformation pattern in the mantle, and (3) the significance of detachment faults during continental breakup. We argue
that the transition from wide rifting towards narrow rifting with a pronounced polarity towards the rift center is associated
with the advective growth of a thermal perturbation in the mantle lithosphere. 相似文献
5.
UrsSchaltegger LaurentDesmurs GianretoManatschal OthmarMüntener MartinMeier MartinFrank & DanielBernoulli 《地学学报》2002,14(3):156-162
We provide new geological and isotope geochemical constraints on the evolution from continental rifting to sea-floor spreading along a segment of the Jurassic Tethyan margin exposed in the Platta and Err nappes (eastern Central Alps). Field observations show that the ocean–continent transition zone is characterized by oceanward-dipping detachment faults leading to the exhumation of subcontinental mantle rocks subsequently intruded by gabbro bodies and dolerite dikes, and covered by pillow basalts and radiolarites. Zircons extracted from gabbros and albitite yield concordant U–Pb ages of 161 ± 1 Ma; their initial ɛHf (+ 14.4 to + 14.9) as well as bulk rock ɛNd values of from gabbros and basalts (+ 7.3 to + 9.5) point to a MORB-type depleted mantle source. These data suggest that the onset of magmatic activity coincides with the latest phase of mantle exhumation along low-angle detachment faults and may be controlled by upwelling asthenosphere beneath a zone of exhumed continental mantle. 相似文献
6.
Nicolò Incerpi Luca Martire Gianreto Manatschal Stefano M. Bernasconi 《Swiss Journal of Geoscience》2017,110(2):439-456
This paper investigates hydrothermal fluid circulation in pre- and syn-tectonic sediments associated with detachments faults. The study area, located in the Err Nappe (SE-Switzerland), preserves a portion of the Adriatic distal margin. Two sites were studied in combining fieldwork, petrography, geochemistry and fluid inclusion analysis: the Piz Val Lunga and Fuorcla Cotschna areas. Both preserve relationships between a spectacularly exposed rift-related extensional detachment fault and its footwall and hangingwall that consist of extensional allochthons and syn- to post-tectonic sediments. These areas register a complex fluid flow history characterized by dolomitization, de-dolomitization, calcite cementation, dolomite and quartz veining and diffuse silicification. Meso- and micro-scale observations allow defining two steps in fluid evolution, which are related to Jurassic rift activity. A first carbonate-rich event occurred before the exhumation of the granitic basement, and this was followed by a second event marked by a change in the fluid towards a silica-dominated chemistry. Homogenization temperatures of fluid inclusions (average Th = 120?130 °C), negative δ18O values and a radiogenic 87Sr/86Sr signatures of carbonate minerals support the hypothesis that both the pre-tectonic rocks constituting the allochthons and the syn-tectonic sediments overlying the detachment fault were crossed by a flux of over-pressured hydrothermal fluids originating from seawater that penetrated into the basement through fault and fracture systems. Field relationships show that this fluid circulation started latest in middle Early Jurassic time, when fault activity migrated from the proximal to the future distal margin. We propose that it evolved chemically as a result of the involvement of the granitic basement forming the footwall of the extensional detachment system. Hydrothermal activity continued until the Middle/Late Jurassic, when tectonic activity shifted outwards leading to the exhumation of mantle rocks. This paper provides an original contribution to better understand the complex evolution of hyperextended continental rift domains and to constrain their thermal regimes. 相似文献
7.
Structural studies of the Barmer Basin in Rajasthan, northwest India, demonstrate the important effect that pre-existing faults can have on the geometries of evolving fault systems at both the outcrop and basin-scale. Outcrop exposures on opposing rift margins reveal two distinct, non-coaxial extensional events. On the eastern rift margin northwest–southeast extension was accommodated on southwest- and west-striking faults that form a complex, zig-zag fault network. On the western rift margin northeast–southwest extension was accommodated on northwest-striking faults that form classical extensional geometries.Combining these outcrop studies with subsurface interpretations demonstrates that northwest–southeast extension preceded northeast–southwest extension. Structures active during the early, previously unrecognised extensional event were variably incorporated into the evolving fault systems during the second. In the study area, an inherited rift-oblique fault transferred extension from the rift margin to a mid-rift fault, rather than linking rift margin fault systems directly. The resultant rift margin accommodation structure has important implications for early sediment routing and depocentre evolution, as well as wider reaching implications for the evolution of the rift basin and West Indian Rift System. The discovery of early rifting in the Barmer Basin supports that extension along the West Indian Rift System was long-lived, multi-event, and likely resulted from far-field plate reorganisations. 相似文献
8.
西南三江构造体系突出表现为以昌都-兰坪-思茅地块为中轴的不对称走滑对冲构造,次为与走滑断裂相伴的伸展滑脱、走滑拉分盆地构造体系,再次为块体内部的近北东、北西向走滑断裂系。西南三江造山带构造体系演化分为挤压收缩变形、走滑深熔热隆、走滑剪切伸展、走滑剥蚀隆升等4个阶段。自晚白垩世开始,印度板块与欧亚板块碰撞,西南三江造山带对冲体构造体系初始形成。自渐新世开始,印度板块持续向北楔入欧亚大陆,印度板块与扬子克拉通构成力偶,两者相向、相对运动,挤压与剪切特提斯大洋缝合带及两大陆边缘弧盆系等地质体,西南三江造山带对冲体构造体系进一步发展,近南北向剪切走滑构造体系形成,构造方向也由近东西转为近南北向。而与近南北向主走滑断裂带之相伴的伸展滑脱构造、拉分盆地,块体内部近北东、北西“X”型剪切走滑断裂同时相伴形成。这样,就形成了西南三江造山带大规模的对冲、走滑、旋转及其伴生的伸展、拉分盆地构造的构造体系。 相似文献
9.
In the central part of the internal Western Alps, widespread multidirectional normal faulting resulted in an orogen-scale radial extension during the Neogene. We revisit the frontal Piémont units, between Doire and Ubaye, where contrasting lithologies allow analysing the interference with the N–S trending Oligocene compressive structures. A major extensional structure is the orogen-perpendicular Chenaillet graben, whose development was guided by an E–W trending transfer fault zone between the Chaberton backfold to the north and the Rochebrune backthrust to the south. The Chaberton hinge zone was passively crosscut by planar normal faults, resulting in a E–W trending step-type structure. Within the Rochebrune nappe, E–W trending listric normal faults bound tilted blocks that slipped northward along the basal backthrust surface reactivated as an extensional detachment. Gravity-driven gliding is suggested by the general northward tilting of the structure in relation with the collapse of the Chenaillet graben. The stress tensors computed from brittle deformation analysis confirm the predominance of orogen-parallel extension in the entire frontal Piémont zone. This can be compared with the nearby Briançonnnais nappe stack where the extensional reactivation of thrust surfaces locally resulted in prominent orogen-perpendicular extension. Such a contrasting situation illustrates how the main direction of the late-Alpine extension may be regionally governed by the nature and orientation of the pre-existing structures inherited from the main collision stage. 相似文献
10.
秦岭南缘大巴山褶皱－冲断推覆构造的特征 总被引：14，自引：0，他引：14
秦岭造山带南缘的大巴山巨型逆冲推覆构造主要是在秦岭造山带板块俯冲碰撞造山与中、新生代以来陆内造山过程中长期复合作用形成的。详细的室内外构造研究表明,巴山逆冲推覆构造可以巴山弧形断裂带为界划分为北大巴山逆冲推覆构造和南大巴山逆冲推覆构造。北大巴山自北而南依次由安康－武当推覆体、紫阳－平利推覆体、高桥－镇坪推覆体和高滩推覆体逆冲叠置而成。南大巴山则以镇巴－阳日断裂为界,分为北部的前陆冲断褶皱带和南部的前陆褶皱带。北大巴山主要是印支期碰撞造山作用和燕山期陆内逆冲推覆作用叠加改造的结果,南大巴山则主要是燕山期递进变形过程中的产物。构造变形北强南弱,北以冲断褶皱变形为特征,南以皱褶作用为主;北部褶皱紧闭复杂,向南渐变为宽缓的薄皮构造。逆冲作用在时序上具有由北向南扩展传递的特点。 相似文献
11.
The Lower Tasna Detachment (LTD) is a low-angle fault contact between serpentinized peridotite below and continental basement above. It was formed during Jurassic to Early Cretaceous rifting of a Tethyan continental margin and later captured in a thrust nappe during Tertiary plate convergence. Foliated gabbro, gabbro mylonite, and granitoid mylonite occurring along the LTD record shearing under decreasing temperatures. U–Pb dating of zircon from the gabbro mylonite yielded a Permian age, interpreted as the age of gabbro intrusion, whereas the breakup of the passive margin occurred as late as Early Cretaceous. This suggests that the gabbro belongs to a prerift, lower to middle crustal intrusion 'smeared out' along the detachment by extensional faulting. The juxtaposition of mantle and upper crust along the Lower Tasna detachment may serve as a model for several seismic reflectors observed in distal passive continental margins (e.g. S reflector of the Galicia margin). 相似文献
12.
This paper presents a review of the Quaternary–Recent deformation field and mountain building processes within the Gobi Corridor region of Central Asia, which includes the North Tibetan foreland, Beishan, Gobi Altai and easternmost Tien Shan. The region can be considered the ‘soft core’ of Central Asia which has been reactivated due to the continuing Indo-Eurasia collision to the south. Favourable preconditions for reactivation of Gobi Corridor basement include a mechanically weak Palaeozoic terrane collage sandwiched between rigid Precambrian basement blocks to the north and south, thermally weakened crust due to Jurassic–Miocene volcanism and widespread Palaeozoic–Mesozoic granitic magmatism with associated high radiogenic heat production, and crustal thinning due to widespread Cretaceous rift basin development. The network of Quaternary–Recent faults within the entire region defines a diffuse sinistral transpressional deformation field that has generated a transpressional basin and range physiographic province. Typically, thrust and oblique-slip thrust faults are WNW-striking and reactivate basement faults and fabrics, whereas left-lateral strike-slip faults are ENE-striking and cut across basement trends. The angular relationship between SHmax and pre-existing basement structural trends is the fundamental control on the kinematics of Late Cenozoic deformation. Along-strike and across-strike growth and coalescence of restraining bends, other transpressional ranges and thrust ridges is an important mountain building process. Thrust faults throughout the region are both NNE and SSW directed and thus there is no common structural vergence, nor orogenic foreland or hinterland. Root structures appear to be vertical faults, not low-angle decollements and flower structure fault geometries within individual ranges are common. Published earthquake and geodetic data are consistent with a diffusely deforming continental interior region with tectonic loading shared amongst a complex network of faults. Therefore, earthquake prediction is likely to be more complex than in plate boundary settings and extrapolation of derived Late Quaternary fault slip rates is not straightforward. Modern mountain building within the Gobi Corridor demonstrates that reactivation of ancient accretionary and collisional orogens within continental interiors can play an important role in continental evolution and the life cycle of orogenic belts. 相似文献
13.
14.
松树沟蛇绿岩是东秦岭构造带内出露规模最大的超镁铁—镁铁质杂岩体。地质填图证实，该区存在结构十分复杂的大型逆冲推覆构造系统，其中北区松树沟超镁铁质主岩体内发育的高角度逆冲断层系向北拆离；而包括富水杂岩在内的南区镁铁质及超镁铁质岩块均向南大规模逆掩；剖面上总体构成不对称（向南滑脱为主）的“背冲型”样式。松树沟逆冲推覆构造研究对恢复蛇绿岩组合层序及其古构造环境具有重要的地质意义。 相似文献
15.
裂陷盆地常常经历了多层次、多周期的幕式沉降过程。若盆地的演化包括了两幕或以上的裂陷旋回,则称之为多幕裂陷盆地。多幕裂陷盆地构造演化特别是复杂的断裂发育特征及其活动方式引起国际地质学家广泛的关注。多幕次裂陷作用下断裂活动方式的转型,必然会导致物源水系、沉积物入口位置及砂体分散方式的系统性差异。前人研究表明,在第一幕裂陷或者单幕裂陷盆地中断裂经常会发生分段联接。在盆地演化的早期各个洼陷较为分散和孤立,主要以陡坡带和缓坡带水系供源为主,而在断裂发生连锁之后,轴向水系供源体系则开始占据主导。相比较第一幕裂陷,第二幕裂陷作用下盆内断裂活动方式多变化,其沉积响应十分复杂。珠江口盆地陆丰凹陷始新世发育两幕裂陷(Ⅰ幕和Ⅱ幕),区域构造应力场方向偏转可能诱导了主干断层的差异活动,致使裂陷中心从南向北发生迁移。研究表明陆丰凹陷两幕次裂陷旋回的构造-沉积响应差异明显:(1)裂陷Ⅰ幕初始断陷阶段断层位移量相对较小,湖盆表现为“浅盆”特征,而裂陷Ⅱ幕早期阶段快速形成规模大、活动性强的边界断层,湖盆则快速进入深湖环境;(2)裂陷Ⅰ幕初始断陷阶段厚度中心小且较为分散,而裂陷Ⅱ幕早期阶段厚度中心规模大,较为统一;(3)裂陷Ⅰ幕初始-强烈断陷阶段以陡坡带、转换带和缓坡带侧向水系供源为主,而裂陷Ⅱ幕早期轴向水系占据主导。在伸展应力方向偏转的多幕裂谷盆地,晚期裂陷幕往往以特定的边界断层迅速生长和复活为特征。近似垂直于新的应力场方向的先存断层则优先活动,在该地区的位移量快速达到最大,这促进了大型轴向供源体系的形成;而未复活断层控制的地区构造沉降弱,继承了早期裂陷结束时长轴水系供源的格局,具有整体“富砂”的沉积特征。以上认识对珠江口盆地及其他多幕裂陷盆地演化分析及砂体预测具有重要的理论价值。 相似文献
16.
利用地震资料、油气勘探资料分析了南海北部大陆边缘珠江口-琼东南新生代盆地断裂系统的时空差异及动力学成因机制.珠江口-琼东南盆地古近系裂陷构造层以NE向、近EW向基底正断层构成的伸展断裂系统的几何学、运动学沿着盆地走向有明显变化,盆地内部隐伏的区域性和局部的NW向断裂及相关构造变形带构成伸展断裂系统之间的构造变换带.在空间上,区域性的云开、松涛-松南等NW向构造变换带以西为NE-NEE向正断层构成的"非拆离"伸展断层系,以东为NE向正断层、近EW向正断层(走滑正断层)复合而成的拆离伸展断层系.在时间上,古近纪裂陷作用可划分为早(文昌组沉积期)、中(恩平组/崖城组沉积期)、晚(珠海组/陵水组沉积期)3个有明显差异的裂陷期.裂陷早期,盆地西部以平面式正断层控制的简单地堑、半地堑为主,伸展量相对较小,东部则以铲式正断层控制的复式地堑、半地堑为主,伸展量相对大,断层向深部收敛在中地壳韧性层构成拆离的伸展断层系统.裂陷中期,琼东南盆地、珠江口盆地西部断裂具有继承性活动特点,珠江口盆地东部发育NWW-EW向伸展断层,并向深层切割早期浅层拆离断层,形成深层拆离伸展断层系统,而沿着云开构造变换带发育反转构造.裂陷晚期,琼东南盆地、珠江口盆地西部断裂具有活动性减弱特点,琼东南盆地东部发育NWW-EW向伸展断层,形成深层拆离伸展断层系统,而沿着琼中央构造变换带发育反转、走滑构造.珠江口-琼东南盆地不同区段断裂系统及其构造演化的差异性受盆地基底先存构造、地壳及岩石圈结构及伸展量等多方面因素的影响,拆离伸展断层系统与发育NWW向"贯穿"断裂的基底构造薄弱带、现今地壳局部减薄带相关,南海扩展由东而西的迁移诱导北部大陆边缘块体沿着先存NW向深大断裂发生走滑旋转是导致变换构造带两侧差异伸展的动力学原因,应力场及岩石圈热结构变化是引起拆离断层深度变化的重要因素. 相似文献
17.
Four major fault systems oriented N–S to NNE–SSW, NE–SW, E–W and NW–SE are identified from Landsat Thematic Mapper (TM) images and a high resolution digital elevation model (DEM) over the Ethiopian Rift Valley and the surrounding plateaus. Most of these faults are the result of Cenozoic - extensional reactivation of pre-existing basement structures. These faults interacted with each other at different geological times under different geodynamic conditions. The Cenozoic interaction under an extensional tectonic regime is the major cause of the actual volcano-tectonic landscape in Ethiopia. The Wonji Fault Belt (WFB), which comprises the N–S to NNE–SSW striking rift floor faults, displays peculiar propagation patterns mainly due to interaction with the other fault systems and the influence of underlying basement structures. The commonly observed patterns are: curvilinear oblique-slip faults forming lip-horsts, sinusoidal faults, intersecting faults and locally splaying faults at their ends. Fault-related open structures such as tail-cracks, releasing bends and extensional relay zones and fault intersections have served as principal eruption sites for monogenetic Plio-Quaternary volcanoes in the Main Ethiopian Rift (MER). 相似文献
18.
The island of Ios in the Cyclades, Aegean Sea, Greece, exposes high pressure metamorphic rocks that were subjected to Miocene continental extension subsequent to the Alpine collisional orogeny. The pre-Alpine history of the lower-plate of this Aegean metamorphic core complex involves intrusion of granitoids into metasediments which subsequently underwent Hercynian amphibolite facies metamorphism. During the Alpine orogeny (D2), these rocks were overthrust by the Cyclades blueschist nappe. Later, the lower plate was tectonically exhumed during Oligo-Miocene continental extension and associated plutonism. Final exhumation occurred as a result of the operation of a south-directed, crustal-scale shear zone and low-angle normal faults. This study shows that the Ios core complex reflects an intrinsic relationship between early thrusting and later extensional tectonism. Basement rocks have been exhumed from beneath the nappes that originally overrode them. 相似文献
19.
The Vado di Corno Fault Zone (VCFZ) is an active extensional fault cutting through carbonates in the Italian Central Apennines. The fault zone was exhumed from ∼2 km depth and accommodated a normal throw of ∼2 km since Early-Pleistocene. In the studied area, the master fault of the VCFZ dips N210/54° and juxtaposes Quaternary colluvial deposits in the hangingwall with cataclastic dolostones in the footwall. Detailed mapping of the fault zone rocks within the ∼300 m thick footwall-block evidenced the presence of five main structural units (Low Strain Damage Zone, High Strain Damage Zone, Breccia Unit, Cataclastic Unit 1 and Cataclastic Unit 2). The Breccia Unit results from the Pleistocene extensional reactivation of a pre-existing Pliocene thrust. The Cataclastic Unit 1 forms a ∼40 m thick band lining the master fault and recording in-situ shattering due to the propagation of multiple seismic ruptures. Seismic faulting is suggested also by the occurrence of mirror-like slip surfaces, highly localized sheared calcite-bearing veins and fluidized cataclasites. The VCFZ architecture compares well with seismological studies of the L'Aquila 2009 seismic sequence (mainshock MW 6.1), which imaged the reactivation of shallow-seated low-angle normal faults (Breccia Unit) cut by major high-angle normal faults (Cataclastic Units). 相似文献
20.
运用丰富的三维地震资料,在断裂体系的静态描述基础上,通过断层活动速率计算和平衡剖面分析,并结合残留地
层展布特征,恢复了新生代盆地垂向演化与叠合过程,探讨盆地发育与转型的动力学机制。珠一坳陷新生代经历了裂陷早
期、裂陷晚期、裂后拗陷和构造活动期四大演化阶段。裂陷期（E2w-E2e）,印支地块旋转挤出和古南海俯冲,区域拉张应
力场由NW 向顺时针转变为近SN 向,导致了裂陷早期NE、NEE 向断裂控盆向裂陷晚期近EW 向、NWW 向断裂控盆转变,
岩石圈伸展作用由宽裂谷方式向窄裂谷方式转变,导致盆地格局由彼此孤立的半地堑或窄地堑系趋于相互扩展连通;裂后
拗陷期（E3z-N1z-N1h）,岩石圈伸展中心迁移至南海扩张中心,南海北部地区整体处于裂后热沉降阶段,构造活动微弱;构
造活化期（N1y-N2w-Q）,菲律宾海板块NWW 向仰冲-碰撞联合作用下产生NNE 向拉张,同时派生近EW 向和NW 向的共
轭剪切作用,导致了先存NWW 向和近EW 断裂的活化,以及隆起区NWW 向张性断裂和近EW 向、NW 向走滑断裂带的形
成。该研究所揭示的盆地发育演化过程不仅对该区油气勘探提供指导,也对被动大陆边缘演化的研究有着一定的借鉴意义。 相似文献